sleep hormone melatonin and disrupt the natural sleep-wake cycle.
“It also may disturb day-to-day variations of stress hormones and affect other metabolic processes in ways that contribute to weight gain,” Park added.
Keeping a light on might also result in poorer sleep. Shorter sleep could prompt you to exercise less and eat more, he noted.
For the study, Park’s team relied on self-reported data from nearly 44,000 women, aged 35 to 74. They weren’t shift workers, daytime sleepers or pregnant when the study began.
Women who slept with a light on were 17% more likely to gain 11 pounds or more over